6.03 Calorimetry Lab

In this experiment, for exercise 1, the final result of pH for distilled water has increased drastically after added 2mL NaOH from 5.87 to 12.12 compared to pH 5.9, 6.9 and 7.9. Before adding 2mL NaOH, pH reading of distilled water was 5.87 which is far from neutral. This maybe because of distilled water is contaminated or the pH meter is not cleaned properly. For ∆ pH, it shows that pH 6.9 has low value which 0.16. For exercise 2, titrate starts at 11mL with pH reading of 1.52. Then continuing adding 0.5mL aliquots of NaOH into the unknown amino acid solution (A) till volume reaches 21.5mL with pH reading of pH 2.08. At 22mL, decided to add 1mL aliquots of NaOH into the unknown amino acid solution (A) till volume reaches 45mL. It pH reading